C++ Recursion: Calculating the power of a number using recursive function

C++ Recursion: Exercise-7 with Solution

Write a C++ program to implement a recursive function to calculate the power of a number.

Sample Solution:

C Code:

// Recursive function to calculate the power of a number
#include <iostream> // Including the Input/Output Stream Library

// Recursive function to calculate the power of a number
int power(int b, int e) {
  // Base case: Any number raised to the power of 0 is 1
  if (e == 0)
    return 1;

  // Recursive case: Calculate the power using recursion
  // by multiplying the base with the power of (exponent - 1)
  return b * power(b, e - 1);
}

int main() {
  int b, e; // Declaring variables for base and exponent

  std::cout << "Input the base number: ";
  std::cin >> b; // Taking input for the base number

  std::cout << "Input the exponent: ";
  std::cin >> e; // Taking input for the exponent

  // Calculate the power using recursion
  int result = power(b, e); // Storing the result of the power calculation

  // Display the result
  std::cout << b << " raised to the power of " << e << " is: " << result << std::endl;

  return 0; // Returning 0 to indicate successful execution of the program
}

Sample Output:

Input the base number: 2
Input the exponent: 3
2 raised to the power of 3 is: 8

Input the base number: 10
Input the exponent: 4
10 raised to the power of 4 is: 10000

Explanation:

In the above exercise,

• The "power()" function takes two integers base and exponent as parameters and calculates the power of the base number using recursion.
• The base case is when the exponent is 0, in which case the function returns 1 since any number raised to the power of 0 is 1.
• In the recursive case, the function calculates the power by multiplying the base with the power of (exponent - 1) using recursion.
• The "main()" function prompts the user to input the base number and the exponent, calls the "power()" function to calculate the power, and then displays the result.

Flowchart:

CPP Code Editor:

Contribute your code and comments through Disqus.

Previous C++ Exercise: Reversing a string using recursive function.
Next C++ Exercise: Checking palindrome strings using recursive function.